ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28%5CN%3DC3/c1ccccc1%5CC%3DC/c2c3cccc2%29CCNC/file?format=sdf&get3d=True  -- O%28%5CN%3DC3/c1ccccc1%5CC%3DC/c2c3cccc2%29CCNC could not be loaded.